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glibc/math/gen-libm-test.py
Adhemerval Zanella 3e8814903c math: Refactor how to use libm-test-ulps 
The current approach tracks math maximum supported errors by explicitly
setting them per function and architecture. On newer implementations or
new compiler versions, the file is updated with newer values if it
shows higher results. The idea is to track the maximum known error, to
update the manual with the obtained values.

The constant libm-test-ulps shows little value, where it is usually a
mechanical change done by the maintainer, for past releases it is
usually ignored whether the ulp change resulted from a compiler
regression, and the math tests already have a maximum ulp error that
triggers a regression.

It was shown by a recent update after the new acosf [1] implementation
that is correctly rounded, where the libm-test-ulps was indeed from a
compiler issue.

This patch removes all arch-specific libm-test-ulps, adds system generic
libm-test-ulps where applicable, and changes its semantics. The generic
files now track specific implementation constraints, like if it is
expected to be correctly rounded, or if the system-specific has
different error expectations.

Now multiple libm-test-ulps can be defined, and system-specific
overrides generic implementation.  This is for the case where
arch-specific implementation might show worse precision than generic
implementation, for instance, the cbrtf on i686.

Regressions are only reported if the implementation shows larger errors
than 9 ulps (13 for IBM long double) unless it is overridden by
libm-test-ulps and the maximum error is not printed at the end of tests.
The regen-ulps rule is also removed since it does not make sense to
update the libm-test-ulps automatically.

The manual error table is also removed, Paul Zimmermann and others have
been tracking libm precision with a more comprehensive analysis for some
releases; so link to his work instead.

[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=9cc9f8e11e8fb8f54f1e84d9f024917634a78201
2025-03-12 13:40:07 -03:00

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#!/usr/bin/python3
# Generate tests for libm functions.
# Copyright (C) 2018-2025 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
import argparse
from collections import defaultdict
import os
import re
# Sorted list of all float types in ulps files.
ALL_FLOATS = ('double', 'float', 'float128', 'ldouble')
# Map float types in ulps files to C-like prefix for macros.
ALL_FLOATS_PFX = {'double': 'DBL',
'ldouble': 'LDBL',
'float': 'FLT',
'float128': 'FLT128'}
# Float types in the order used in the generated ulps tables in the
# manual.
ALL_FLOATS_MANUAL = ('float', 'double', 'ldouble', 'float128')
# Map float types in ulps files to C function suffix.
ALL_FLOATS_SUFFIX = {'double': '',
'ldouble': 'l',
'float': 'f',
'float128': 'f128'}
# Number of arguments in structure (as opposed to arguments that are
# pointers to return values) for an argument descriptor.
DESCR_NUM_ARGS = {'f': 1, 'a': 1, 'j': 1, 'i': 1, 'u': 1, 'l': 1, 'L': 1,
'p': 0, 'F': 0, 'I': 0,
'c': 2}
# Number of results in structure for a result descriptor.
DESCR_NUM_RES = {'f': 1, 'i': 1, 'l': 1, 'L': 1, 'M': 1, 'U': 1, 'b': 1,
'1': 1,
'c': 2}
# Rounding modes, in the form in which they appear in
# auto-libm-test-out-* and the order in which expected results appear
# in structures and TEST_* calls.
ROUNDING_MODES = ('downward', 'tonearest', 'towardzero', 'upward')
# Map from special text in TEST_* calls for rounding-mode-specific
# results and flags, to those results for each mode.
ROUNDING_MAP = {
'plus_oflow': ('max_value', 'plus_infty', 'max_value', 'plus_infty'),
'minus_oflow': ('minus_infty', 'minus_infty', '-max_value', '-max_value'),
'plus_uflow': ('plus_zero', 'plus_zero', 'plus_zero', 'min_subnorm_value'),
'minus_uflow': ('-min_subnorm_value', 'minus_zero', 'minus_zero',
'minus_zero'),
'ERRNO_PLUS_OFLOW': ('0', 'ERRNO_ERANGE', '0', 'ERRNO_ERANGE'),
'ERRNO_MINUS_OFLOW': ('ERRNO_ERANGE', 'ERRNO_ERANGE', '0', '0'),
'ERRNO_PLUS_UFLOW': ('ERRNO_ERANGE', 'ERRNO_ERANGE', 'ERRNO_ERANGE', '0'),
'ERRNO_MINUS_UFLOW': ('0', 'ERRNO_ERANGE', 'ERRNO_ERANGE', 'ERRNO_ERANGE'),
'XFAIL_ROUNDING_IBM128_LIBGCC': ('XFAIL_IBM128_LIBGCC', '0',
'XFAIL_IBM128_LIBGCC',
'XFAIL_IBM128_LIBGCC')
}
# Map from raw test arguments to a nicer form to use when displaying
# test results.
BEAUTIFY_MAP = {'minus_zero': '-0',
'plus_zero': '+0',
'-0x0p+0f': '-0',
'-0x0p+0': '-0',
'-0x0p+0L': '-0',
'0x0p+0f': '+0',
'0x0p+0': '+0',
'0x0p+0L': '+0',
'minus_infty': '-inf',
'plus_infty': 'inf',
'qnan_value': 'qNaN',
'snan_value': 'sNaN',
'snan_value_ld': 'sNaN'}
# Flags in auto-libm-test-out that map directly to C flags.
FLAGS_SIMPLE = {'ignore-zero-inf-sign': 'IGNORE_ZERO_INF_SIGN',
'xfail': 'XFAIL_TEST'}
# Exceptions in auto-libm-test-out, and their corresponding C flags
# for being required, OK or required to be absent.
EXC_EXPECTED = {'divbyzero': 'DIVBYZERO_EXCEPTION',
'inexact': 'INEXACT_EXCEPTION',
'invalid': 'INVALID_EXCEPTION',
'overflow': 'OVERFLOW_EXCEPTION',
'underflow': 'UNDERFLOW_EXCEPTION'}
EXC_OK = {'divbyzero': 'DIVIDE_BY_ZERO_EXCEPTION_OK',
'inexact': '0',
'invalid': 'INVALID_EXCEPTION_OK',
'overflow': 'OVERFLOW_EXCEPTION_OK',
'underflow': 'UNDERFLOW_EXCEPTION_OK'}
EXC_NO = {'divbyzero': '0',
'inexact': 'NO_INEXACT_EXCEPTION',
'invalid': '0',
'overflow': '0',
'underflow': '0'}
class Ulps(object):
"""Maximum expected errors of libm functions."""
def __init__(self):
"""Initialize an Ulps object."""
# normal[function][float_type] is the ulps value, and likewise
# for real and imag.
self.normal = defaultdict(lambda: defaultdict(lambda: -1))
self.real = defaultdict(lambda: defaultdict(lambda: -1))
self.imag = defaultdict(lambda: defaultdict(lambda: -1))
# List of ulps kinds, in the order in which they appear in
# sorted ulps files.
self.ulps_kinds = (('Real part of ', self.real),
('Imaginary part of ', self.imag),
('', self.normal))
self.ulps_file = []
self
def read(self, ulps_file):
"""Read ulps from a file into an Ulps object."""
self.ulps_file.append(ulps_file)
with open(ulps_file, 'r') as f:
ulps_dict = None
ulps_fn = None
for line in f:
# Ignore comments.
if line.startswith('#'):
continue
line = line.rstrip()
# Ignore empty lines.
if line == '':
continue
m = re.match(r'([^:]*): (.*)\Z', line)
if not m:
raise ValueError('bad ulps line: %s' % line)
line_first = m.group(1)
line_second = m.group(2)
if line_first == 'Function':
fn = None
ulps_dict = None
for k_prefix, k_dict in self.ulps_kinds:
if line_second.startswith(k_prefix):
ulps_dict = k_dict
fn = line_second[len(k_prefix):]
break
if not fn.startswith('"') or not fn.endswith('":'):
raise ValueError('bad ulps line: %s' % line)
ulps_fn = fn[1:-2]
else:
if line_first not in ALL_FLOATS:
raise ValueError('bad ulps line: %s' % line)
ulps_val = int(line_second)
ulps_dict[ulps_fn][line_first] = ulps_val
def all_functions(self):
"""Return the set of functions with ulps and whether they are
complex."""
funcs = set()
complex = {}
for k_prefix, k_dict in self.ulps_kinds:
for f in k_dict:
funcs.add(f)
complex[f] = True if k_prefix else False
return funcs, complex
@staticmethod
def ulps_table(name, ulps_dict):
"""Return text of a C table of ulps."""
ulps_list = []
for fn in sorted(ulps_dict.keys()):
fn_ulps = [str(ulps_dict[fn][f]) for f in ALL_FLOATS]
ulps_list.append(' { "%s", {%s} },' % (fn, ', '.join(fn_ulps)))
ulps_text = ('static const struct ulp_data %s[] =\n'
' {\n'
'%s\n'
' };'
% (name, '\n'.join(ulps_list)))
return ulps_text
def write_header(self, ulps_header):
"""Write header file with ulps data."""
header_text_1 = ('/* This file is automatically generated\n'
' from %s with gen-libm-test.py.\n'
' Don\'t change it - change instead the master '
'files. */\n\n'
'struct ulp_data\n'
'{\n'
' const char *name;\n'
' FLOAT max_ulp[%d];\n'
'};'
% (', '.join(self.ulps_file), len(ALL_FLOATS)))
macro_list = []
for i, f in enumerate(ALL_FLOATS):
if f.startswith('i'):
itxt = 'I_'
f = f[1:]
else:
itxt = ''
macro_list.append('#define ULP_%s%s %d'
% (itxt, ALL_FLOATS_PFX[f], i))
header_text = ('%s\n\n'
'%s\n\n'
'/* Maximal error of functions. */\n'
'%s\n'
'%s\n'
'%s\n'
% (header_text_1, '\n'.join(macro_list),
self.ulps_table('func_ulps', self.normal),
self.ulps_table('func_real_ulps', self.real),
self.ulps_table('func_imag_ulps', self.imag)))
with open(ulps_header, 'w') as f:
f.write(header_text)
def read_auto_tests(test_file):
"""Read tests from auto-libm-test-out-<function> (possibly None)."""
auto_tests = defaultdict(lambda: defaultdict(dict))
if test_file is None:
return auto_tests
with open(test_file, 'r') as f:
for line in f:
if not line.startswith('= '):
continue
line = line[len('= '):].rstrip()
# Function, rounding mode, condition and inputs, outputs
# and flags.
m = re.match(r'([^ ]+) ([^ ]+) ([^: ][^ ]* [^:]*) : (.*)\Z', line)
if not m:
raise ValueError('bad automatic test line: %s' % line)
auto_tests[m.group(1)][m.group(2)][m.group(3)] = m.group(4)
return auto_tests
def beautify(arg):
"""Return a nicer representation of a test argument."""
if arg in BEAUTIFY_MAP:
return BEAUTIFY_MAP[arg]
if arg.startswith('-') and arg[1:] in BEAUTIFY_MAP:
return '-' + BEAUTIFY_MAP[arg[1:]]
if re.match(r'-?0x[0-9a-f.]*p[-+][0-9]+f\Z', arg):
return arg[:-1]
if re.search(r'[0-9]L\Z', arg):
return arg[:-1]
return arg
def complex_beautify(arg_real, arg_imag):
"""Return a nicer representation of a complex test argument."""
res_real = beautify(arg_real)
res_imag = beautify(arg_imag)
if res_imag.startswith('-'):
return '%s - %s i' % (res_real, res_imag[1:])
else:
return '%s + %s i' % (res_real, res_imag)
def apply_lit_token(arg, macro):
"""Apply the LIT or ARG_LIT macro to a single token."""
# The macro must only be applied to a floating-point constant, not
# to an integer constant or lit_* value.
sign_re = r'[+-]?'
exp_re = r'([+-])?[0-9]+'
suffix_re = r'[lLfF]?'
dec_exp_re = r'[eE]' + exp_re
hex_exp_re = r'[pP]' + exp_re
dec_frac_re = r'(?:[0-9]*\.[0-9]+|[0-9]+\.)'
hex_frac_re = r'(?:[0-9a-fA-F]*\.[0-9a-fA-F]+|[0-9a-fA-F]+\.)'
dec_int_re = r'[0-9]+'
hex_int_re = r'[0-9a-fA-F]+'
dec_cst_re = r'(?:%s(?:%s)?|%s%s)' % (dec_frac_re, dec_exp_re,
dec_int_re, dec_exp_re)
hex_cst_re = r'0[xX](?:%s|%s)%s' % (hex_frac_re, hex_int_re, hex_exp_re)
fp_cst_re = r'(%s(?:%s|%s))%s\Z' % (sign_re, dec_cst_re, hex_cst_re,
suffix_re)
m = re.match(fp_cst_re, arg)
if m:
return '%s (%s)' % (macro, m.group(1))
else:
return arg
def apply_lit(arg, macro):
"""Apply the LIT or ARG_LIT macro to constants within an expression."""
# Assume expressions follow the GNU Coding Standards, with tokens
# separated by spaces.
return ' '.join([apply_lit_token(t, macro) for t in arg.split()])
def gen_test_args_res(descr_args, descr_res, args, res_rm):
"""Generate a test given the arguments and per-rounding-mode results."""
test_snan = False
all_args_res = list(args)
for r in res_rm:
all_args_res.extend(r[:len(r)-1])
for a in all_args_res:
if 'snan_value' in a:
test_snan = True
# Process the arguments.
args_disp = []
args_c = []
arg_pos = 0
for d in descr_args:
if DESCR_NUM_ARGS[d] == 0:
continue
if d == 'c':
args_disp.append(complex_beautify(args[arg_pos],
args[arg_pos + 1]))
args_c.append(apply_lit(args[arg_pos], 'LIT'))
args_c.append(apply_lit(args[arg_pos + 1], 'LIT'))
else:
args_disp.append(beautify(args[arg_pos]))
if d == 'f':
args_c.append(apply_lit(args[arg_pos], 'LIT'))
elif d == 'a':
args_c.append(apply_lit(args[arg_pos], 'ARG_LIT'))
else:
args_c.append(args[arg_pos])
arg_pos += DESCR_NUM_ARGS[d]
args_disp_text = ', '.join(args_disp).replace('"', '\\"')
# Process the results.
for rm in range(len(ROUNDING_MODES)):
res = res_rm[rm]
res_pos = 0
rm_args = []
ignore_result_any = False
ignore_result_all = True
special = []
for d in descr_res:
if d == '1':
special.append(res[res_pos])
elif DESCR_NUM_RES[d] == 1:
result = res[res_pos]
if result == 'IGNORE':
ignore_result_any = True
result = '0'
else:
ignore_result_all = False
if d == 'f':
result = apply_lit(result, 'LIT')
rm_args.append(result)
else:
# Complex result.
result1 = res[res_pos]
if result1 == 'IGNORE':
ignore_result_any = True
result1 = '0'
else:
ignore_result_all = False
result1 = apply_lit(result1, 'LIT')
rm_args.append(result1)
result2 = res[res_pos + 1]
if result2 == 'IGNORE':
ignore_result_any = True
result2 = '0'
else:
ignore_result_all = False
result2 = apply_lit(result2, 'LIT')
rm_args.append(result2)
res_pos += DESCR_NUM_RES[d]
if ignore_result_any and not ignore_result_all:
raise ValueError('some but not all function results ignored')
flags = []
if ignore_result_any:
flags.append('IGNORE_RESULT')
if test_snan:
flags.append('TEST_SNAN')
flags.append(res[res_pos])
rm_args.append('|'.join(flags))
for sp in special:
if sp == 'IGNORE':
rm_args.extend(['0', '0'])
else:
rm_args.extend(['1', apply_lit(sp, 'LIT')])
for k in sorted(ROUNDING_MAP.keys()):
rm_args = [arg.replace(k, ROUNDING_MAP[k][rm]) for arg in rm_args]
args_c.append('{ %s }' % ', '.join(rm_args))
return ' { "%s", %s },\n' % (args_disp_text, ', '.join(args_c))
def convert_condition(cond):
"""Convert a condition from auto-libm-test-out to C form."""
conds = cond.split(':')
conds_c = []
for c in conds:
if not c.startswith('arg_fmt('):
c = c.replace('-', '_')
conds_c.append('TEST_COND_' + c)
return '(%s)' % ' && '.join(conds_c)
def cond_value(cond, if_val, else_val):
"""Return a C conditional expression between two values."""
if cond == '1':
return if_val
elif cond == '0':
return else_val
else:
return '(%s ? %s : %s)' % (cond, if_val, else_val)
def gen_auto_tests(auto_tests, descr_args, descr_res, fn):
"""Generate C code for the auto-libm-test-out-* tests for a function."""
for rm_idx, rm_name in enumerate(ROUNDING_MODES):
this_tests = sorted(auto_tests[fn][rm_name].keys())
if rm_idx == 0:
rm_tests = this_tests
if not rm_tests:
raise ValueError('no automatic tests for %s' % fn)
else:
if rm_tests != this_tests:
raise ValueError('inconsistent lists of tests of %s' % fn)
test_list = []
for test in rm_tests:
fmt_args = test.split()
fmt = fmt_args[0]
args = fmt_args[1:]
test_list.append('#if %s\n' % convert_condition(fmt))
res_rm = []
for rm in ROUNDING_MODES:
test_out = auto_tests[fn][rm][test]
out_str, flags_str = test_out.split(':', 1)
this_res = out_str.split()
flags = flags_str.split()
flag_cond = {}
for flag in flags:
m = re.match(r'([^:]*):(.*)\Z', flag)
if m:
f_name = m.group(1)
cond = convert_condition(m.group(2))
if f_name in flag_cond:
if flag_cond[f_name] != '1':
flag_cond[f_name] = ('%s || %s'
% (flag_cond[f_name], cond))
else:
flag_cond[f_name] = cond
else:
flag_cond[flag] = '1'
flags_c = []
for flag in sorted(FLAGS_SIMPLE.keys()):
if flag in flag_cond:
flags_c.append(cond_value(flag_cond[flag],
FLAGS_SIMPLE[flag], '0'))
for exc in sorted(EXC_EXPECTED.keys()):
exc_expected = EXC_EXPECTED[exc]
exc_ok = EXC_OK[exc]
no_exc = EXC_NO[exc]
exc_cond = flag_cond.get(exc, '0')
exc_ok_cond = flag_cond.get(exc + '-ok', '0')
flags_c.append(cond_value(exc_cond,
cond_value(exc_ok_cond, exc_ok,
exc_expected),
cond_value(exc_ok_cond, exc_ok,
no_exc)))
if 'errno-edom' in flag_cond and 'errno-erange' in flag_cond:
raise ValueError('multiple errno values expected')
if 'errno-edom' in flag_cond:
if flag_cond['errno-edom'] != '1':
raise ValueError('unexpected condition for errno-edom')
errno_expected = 'ERRNO_EDOM'
elif 'errno-erange' in flag_cond:
if flag_cond['errno-erange'] != '1':
raise ValueError('unexpected condition for errno-erange')
errno_expected = 'ERRNO_ERANGE'
else:
errno_expected = 'ERRNO_UNCHANGED'
if 'errno-edom-ok' in flag_cond:
if ('errno-erange-ok' in flag_cond
and (flag_cond['errno-erange-ok']
!= flag_cond['errno-edom-ok'])):
errno_unknown_cond = ('%s || %s'
% (flag_cond['errno-edom-ok'],
flag_cond['errno-erange-ok']))
else:
errno_unknown_cond = flag_cond['errno-edom-ok']
else:
errno_unknown_cond = flag_cond.get('errno-erange-ok', '0')
flags_c.append(cond_value(errno_unknown_cond, '0', errno_expected))
flags_c = [flag for flag in flags_c if flag != '0']
if not flags_c:
flags_c = ['NO_EXCEPTION']
this_res.append(' | '.join(flags_c))
res_rm.append(this_res)
test_list.append(gen_test_args_res(descr_args, descr_res, args,
res_rm))
test_list.append('#endif\n')
return ''.join(test_list)
def gen_test_line(descr_args, descr_res, args_str):
"""Generate C code for the tests for a single TEST_* line."""
test_args = args_str.split(',')
test_args = test_args[1:]
test_args = [a.strip() for a in test_args]
num_args = sum([DESCR_NUM_ARGS[c] for c in descr_args])
num_res = sum([DESCR_NUM_RES[c] for c in descr_res])
args = test_args[:num_args]
res = test_args[num_args:]
if len(res) == num_res:
# One set of results for all rounding modes, no flags.
res.append('0')
res_rm = [res, res, res, res]
elif len(res) == num_res + 1:
# One set of results for all rounding modes, with flags.
if not ('EXCEPTION' in res[-1]
or 'ERRNO' in res[-1]
or 'IGNORE_ZERO_INF_SIGN' in res[-1]
or 'TEST_NAN_SIGN' in res[-1]
or 'XFAIL' in res[-1]):
raise ValueError('wrong number of arguments: %s' % args_str)
res_rm = [res, res, res, res]
elif len(res) == (num_res + 1) * 4:
# One set of results per rounding mode, with flags.
nr_plus = num_res + 1
res_rm = [res[:nr_plus], res[nr_plus:2*nr_plus],
res[2*nr_plus:3*nr_plus], res[3*nr_plus:]]
return gen_test_args_res(descr_args, descr_res, args, res_rm)
def generate_testfile(inc_input, auto_tests, c_output):
"""Generate test .c file from .inc input."""
test_list = []
with open(inc_input, 'r') as f:
for line in f:
line_strip = line.strip()
if line_strip.startswith('AUTO_TESTS_'):
m = re.match(r'AUTO_TESTS_([^_]*)_([^_ ]*) *\(([^)]*)\),\Z',
line_strip)
if not m:
raise ValueError('bad AUTO_TESTS line: %s' % line)
test_list.append(gen_auto_tests(auto_tests, m.group(1),
m.group(2), m.group(3)))
elif line_strip.startswith('TEST_'):
m = re.match(r'TEST_([^_]*)_([^_ ]*) *\((.*)\),\Z', line_strip)
if not m:
raise ValueError('bad TEST line: %s' % line)
test_list.append(gen_test_line(m.group(1), m.group(2),
m.group(3)))
else:
test_list.append(line)
with open(c_output, 'w') as f:
f.write(''.join(test_list))
def generate_err_table_sub(all_ulps, all_functions, fns_complex, platforms):
"""Generate a single table within the overall ulps table section."""
plat_width = [' {1000 + i 1000}' for p in platforms]
plat_header = [' @tab %s' % p for p in platforms]
table_list = ['@multitable {nexttowardf} %s\n' % ''.join(plat_width),
'@item Function %s\n' % ''.join(plat_header)]
for func in all_functions:
for flt in ALL_FLOATS_MANUAL:
func_ulps = []
for p in platforms:
p_ulps = all_ulps[p]
if fns_complex[func]:
ulp_real = p_ulps.real[func][flt]
ulp_imag = p_ulps.imag[func][flt]
ulp_str = '%d + i %d' % (ulp_real, ulp_imag)
ulp_str = ulp_str if ulp_real or ulp_imag else '-'
else:
ulp = p_ulps.normal[func][flt]
ulp_str = str(ulp) if ulp else '-'
func_ulps.append(ulp_str)
table_list.append('@item %s%s @tab %s\n'
% (func, ALL_FLOATS_SUFFIX[flt],
' @tab '.join(func_ulps)))
table_list.append('@end multitable\n')
return ''.join(table_list)
def generate_err_table(all_ulps, err_table):
"""Generate ulps table for manual."""
all_platforms = sorted(all_ulps.keys())
functions_set = set()
functions_complex = {}
for p in all_platforms:
p_functions, p_complex = all_ulps[p].all_functions()
functions_set.update(p_functions)
functions_complex.update(p_complex)
all_functions = sorted([f for f in functions_set
if ('_downward' not in f
and '_towardzero' not in f
and '_upward' not in f
and '_vlen' not in f)])
err_table_list = []
# Print five platforms at a time.
num_platforms = len(all_platforms)
for i in range((num_platforms + 4) // 5):
start = i * 5
end = i * 5 + 5 if num_platforms >= i * 5 + 5 else num_platforms
err_table_list.append(generate_err_table_sub(all_ulps, all_functions,
functions_complex,
all_platforms[start:end]))
with open(err_table, 'w') as f:
f.write(''.join(err_table_list))
def main():
"""The main entry point."""
parser = argparse.ArgumentParser(description='Generate libm tests.')
parser.add_argument('-a', dest='auto_input', metavar='FILE',
help='input file with automatically generated tests')
parser.add_argument('-c', dest='inc_input', metavar='FILE',
help='input file .inc file with tests')
parser.add_argument('-u', dest='ulps_file', metavar='list',
help='input files with ulps (multiple input separated by colon')
parser.add_argument('-C', dest='c_output', metavar='FILE',
help='generate output C file FILE from .inc file')
parser.add_argument('-H', dest='ulps_header', metavar='FILE',
help='generate output ulps header FILE')
parser.add_argument('-m', dest='err_table', metavar='FILE',
help='generate output ulps table for manual FILE')
args = parser.parse_args()
ulps = Ulps()
if args.ulps_file is not None:
# Iterate in reverse order so arch specific definitions can override
# the generic ones.
for ulp_file in reversed(args.ulps_file.split(':')):
ulps.read(ulp_file)
auto_tests = read_auto_tests(args.auto_input)
if args.ulps_header is not None:
ulps.write_header(args.ulps_header)
if args.c_output is not None:
generate_testfile(args.inc_input, auto_tests, args.c_output)
if args.err_table is not None:
generate_err_table(all_ulps, args.err_table)
if __name__ == '__main__':
main()
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